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|                      |   | 2011   |      |   | 2010   |   |      | 2009   |   |   | 2008      |   |   | 2007   |      |
|---------------------------|--------|--------|-----------|--------|--------|--------|-----------|--------|--------|--------|-----------|--------|--------|--------|-----------|
| Computation of net income |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |
| per share:                |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |
|                      |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |
| BASIC                     |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |
| Weighted average          |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |
| number of primary         |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |
| shares outstanding        |   |   | 2,151,443 |   |   |   | 2,129,417 |   |   |   | 2,107,643 |   |   |   | 2,079,734 |   |   |   | 2,048,626 |   |
|                      |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| Net income                |   | $      | 3,857,537 |   |   | $      | 3,564,962 |   |   | $      | 2,733,240 |   |   | $      | 3,421,869 |   |   | $ | 2,544,720 |   |
|                      |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| Per share-basic           |   | $      | 1.79      |   |   | $      | 1.67      |   |   | $      | 1.30      |   |   | $      | 1.65      |   |   | $ | 1.24 |   |
|                      |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| DILUTED                   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| Weighted average          |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| number of primary         |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| shares outstanding        |   |   | 2,176,299 |   |   |   | 2,137,799 |   |   |   | 2,113,798 |   |   |   | 2,103,836 |   |   |   | 2,077,664 |   |
|                      |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| Net effect of             |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| dilutive stock            |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| options based on          |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| treasury stock            |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| method                    |   |   | 24,856    |   |   |   | 8,382     |   |   |   | 6,155     |   |   |   | 24,102    |   |   |   | 29,038 |   |
|                      |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| Net income                |   | $      | 3,857,537 |   |   | $      | 3,564,962 |   |   | $      | 2,733,240 |   |   | $      | 3,421,869 |   |   | $ | 2,544,720 |   |
|                      |   |   |      |   |   |   |      |   |   |   |      |   |   |   |      |   |   |   |   |   |
| Per share-diluted         |   | $      | 1.77      |   |   | $      | 1.67      |   |   | $      | 1.29      |   |   | $      | 1.63      |   |   | $ | 1.23 |   |

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